2010-II-28 Posted on 16-06-202121-06-2023 By app.cch No Comments on 2010-II-28 Ans: DNote that BC is the line of intersection of planes ABC and DBC. Since AE⊥BC and DE⊥BC, then the angle between the plane ABC and the horizontal ground is ∠AED. Same Topic: 2006-I-17 2006-II-45 2010-I-15 2010-II-48 2010, HKCEE, Paper 2 Tags:3D Problems
